author | Mikael Berthe <mikael@lilotux.net> |
Sun, 16 Feb 2020 18:54:01 +0100 | |
changeset 251 | 1c52a0eeb952 |
parent 242 | 2a9ec03fe5a1 |
child 256 | 6d9efbef00a9 |
permissions | -rw-r--r-- |
242
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1 |
// Copyright © 2014 Steve Francia <spf@spf13.com>. |
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2 |
// |
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3 |
// Use of this source code is governed by an MIT-style |
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4 |
// license that can be found in the LICENSE file. |
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5 |
|
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6 |
// Viper is a application configuration system. |
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7 |
// It believes that applications can be configured a variety of ways |
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8 |
// via flags, ENVIRONMENT variables, configuration files retrieved |
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9 |
// from the file system, or a remote key/value store. |
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10 |
|
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11 |
package viper |
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12 |
|
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13 |
import ( |
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14 |
"fmt" |
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15 |
"os" |
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16 |
"path/filepath" |
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17 |
"runtime" |
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18 |
"strings" |
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19 |
"unicode" |
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20 |
|
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21 |
"github.com/spf13/afero" |
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22 |
"github.com/spf13/cast" |
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23 |
jww "github.com/spf13/jwalterweatherman" |
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24 |
) |
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25 |
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26 |
// ConfigParseError denotes failing to parse configuration file. |
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27 |
type ConfigParseError struct { |
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28 |
err error |
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29 |
} |
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30 |
|
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31 |
// Error returns the formatted configuration error. |
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32 |
func (pe ConfigParseError) Error() string { |
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return fmt.Sprintf("While parsing config: %s", pe.err.Error()) |
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34 |
} |
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35 |
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// toCaseInsensitiveValue checks if the value is a map; |
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// if so, create a copy and lower-case the keys recursively. |
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38 |
func toCaseInsensitiveValue(value interface{}) interface{} { |
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39 |
switch v := value.(type) { |
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case map[interface{}]interface{}: |
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41 |
value = copyAndInsensitiviseMap(cast.ToStringMap(v)) |
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case map[string]interface{}: |
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value = copyAndInsensitiviseMap(v) |
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44 |
} |
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45 |
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46 |
return value |
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47 |
} |
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48 |
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49 |
// copyAndInsensitiviseMap behaves like insensitiviseMap, but creates a copy of |
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50 |
// any map it makes case insensitive. |
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51 |
func copyAndInsensitiviseMap(m map[string]interface{}) map[string]interface{} { |
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52 |
nm := make(map[string]interface{}) |
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53 |
|
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54 |
for key, val := range m { |
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55 |
lkey := strings.ToLower(key) |
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56 |
switch v := val.(type) { |
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57 |
case map[interface{}]interface{}: |
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58 |
nm[lkey] = copyAndInsensitiviseMap(cast.ToStringMap(v)) |
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59 |
case map[string]interface{}: |
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60 |
nm[lkey] = copyAndInsensitiviseMap(v) |
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61 |
default: |
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62 |
nm[lkey] = v |
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63 |
} |
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64 |
} |
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65 |
|
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66 |
return nm |
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67 |
} |
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68 |
|
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69 |
func insensitiviseMap(m map[string]interface{}) { |
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70 |
for key, val := range m { |
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71 |
switch val.(type) { |
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72 |
case map[interface{}]interface{}: |
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73 |
// nested map: cast and recursively insensitivise |
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74 |
val = cast.ToStringMap(val) |
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75 |
insensitiviseMap(val.(map[string]interface{})) |
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76 |
case map[string]interface{}: |
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77 |
// nested map: recursively insensitivise |
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78 |
insensitiviseMap(val.(map[string]interface{})) |
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79 |
} |
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80 |
|
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81 |
lower := strings.ToLower(key) |
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82 |
if key != lower { |
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83 |
// remove old key (not lower-cased) |
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84 |
delete(m, key) |
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85 |
} |
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86 |
// update map |
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87 |
m[lower] = val |
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88 |
} |
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89 |
} |
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90 |
|
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91 |
func absPathify(inPath string) string { |
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92 |
jww.INFO.Println("Trying to resolve absolute path to", inPath) |
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93 |
|
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94 |
if strings.HasPrefix(inPath, "$HOME") { |
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95 |
inPath = userHomeDir() + inPath[5:] |
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96 |
} |
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97 |
|
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98 |
if strings.HasPrefix(inPath, "$") { |
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99 |
end := strings.Index(inPath, string(os.PathSeparator)) |
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100 |
inPath = os.Getenv(inPath[1:end]) + inPath[end:] |
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101 |
} |
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102 |
|
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103 |
if filepath.IsAbs(inPath) { |
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104 |
return filepath.Clean(inPath) |
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105 |
} |
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106 |
|
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107 |
p, err := filepath.Abs(inPath) |
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108 |
if err == nil { |
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109 |
return filepath.Clean(p) |
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110 |
} |
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111 |
|
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112 |
jww.ERROR.Println("Couldn't discover absolute path") |
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113 |
jww.ERROR.Println(err) |
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114 |
return "" |
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115 |
} |
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116 |
|
251 | 117 |
// Check if file Exists |
242
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118 |
func exists(fs afero.Fs, path string) (bool, error) { |
251 | 119 |
stat, err := fs.Stat(path) |
242
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120 |
if err == nil { |
251 | 121 |
return !stat.IsDir(), nil |
242
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122 |
} |
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123 |
if os.IsNotExist(err) { |
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124 |
return false, nil |
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125 |
} |
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126 |
return false, err |
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127 |
} |
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128 |
|
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129 |
func stringInSlice(a string, list []string) bool { |
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130 |
for _, b := range list { |
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131 |
if b == a { |
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132 |
return true |
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133 |
} |
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134 |
} |
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135 |
return false |
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136 |
} |
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137 |
|
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138 |
func userHomeDir() string { |
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139 |
if runtime.GOOS == "windows" { |
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140 |
home := os.Getenv("HOMEDRIVE") + os.Getenv("HOMEPATH") |
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141 |
if home == "" { |
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142 |
home = os.Getenv("USERPROFILE") |
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143 |
} |
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144 |
return home |
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145 |
} |
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146 |
return os.Getenv("HOME") |
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147 |
} |
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148 |
|
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149 |
func safeMul(a, b uint) uint { |
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150 |
c := a * b |
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151 |
if a > 1 && b > 1 && c/b != a { |
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152 |
return 0 |
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153 |
} |
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154 |
return c |
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155 |
} |
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156 |
|
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157 |
// parseSizeInBytes converts strings like 1GB or 12 mb into an unsigned integer number of bytes |
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158 |
func parseSizeInBytes(sizeStr string) uint { |
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159 |
sizeStr = strings.TrimSpace(sizeStr) |
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160 |
lastChar := len(sizeStr) - 1 |
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161 |
multiplier := uint(1) |
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162 |
|
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163 |
if lastChar > 0 { |
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164 |
if sizeStr[lastChar] == 'b' || sizeStr[lastChar] == 'B' { |
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165 |
if lastChar > 1 { |
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166 |
switch unicode.ToLower(rune(sizeStr[lastChar-1])) { |
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167 |
case 'k': |
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168 |
multiplier = 1 << 10 |
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169 |
sizeStr = strings.TrimSpace(sizeStr[:lastChar-1]) |
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170 |
case 'm': |
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171 |
multiplier = 1 << 20 |
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172 |
sizeStr = strings.TrimSpace(sizeStr[:lastChar-1]) |
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173 |
case 'g': |
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174 |
multiplier = 1 << 30 |
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175 |
sizeStr = strings.TrimSpace(sizeStr[:lastChar-1]) |
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176 |
default: |
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177 |
multiplier = 1 |
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178 |
sizeStr = strings.TrimSpace(sizeStr[:lastChar]) |
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|
179 |
} |
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180 |
} |
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|
181 |
} |
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|
182 |
} |
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183 |
|
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|
184 |
size := cast.ToInt(sizeStr) |
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|
185 |
if size < 0 { |
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|
186 |
size = 0 |
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187 |
} |
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|
188 |
|
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|
189 |
return safeMul(uint(size), multiplier) |
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|
190 |
} |
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|
191 |
|
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|
192 |
// deepSearch scans deep maps, following the key indexes listed in the |
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|
193 |
// sequence "path". |
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194 |
// The last value is expected to be another map, and is returned. |
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195 |
// |
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196 |
// In case intermediate keys do not exist, or map to a non-map value, |
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197 |
// a new map is created and inserted, and the search continues from there: |
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198 |
// the initial map "m" may be modified! |
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199 |
func deepSearch(m map[string]interface{}, path []string) map[string]interface{} { |
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200 |
for _, k := range path { |
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|
201 |
m2, ok := m[k] |
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|
202 |
if !ok { |
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|
203 |
// intermediate key does not exist |
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|
204 |
// => create it and continue from there |
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|
205 |
m3 := make(map[string]interface{}) |
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|
206 |
m[k] = m3 |
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|
207 |
m = m3 |
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|
208 |
continue |
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|
209 |
} |
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|
210 |
m3, ok := m2.(map[string]interface{}) |
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|
211 |
if !ok { |
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|
212 |
// intermediate key is a value |
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|
213 |
// => replace with a new map |
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|
214 |
m3 = make(map[string]interface{}) |
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|
215 |
m[k] = m3 |
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|
216 |
} |
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|
217 |
// continue search from here |
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|
218 |
m = m3 |
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|
219 |
} |
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|
220 |
return m |
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|
221 |
} |